Award of Medals, S^-c, at Kilburn. 
713 
a zinc box-like urn protected from the air by felt stuffing, a soft 
baggy material hangs down from the bottom of the box ; at 
night, screens shut in the chicken. Surrounding the mother is 
a small yard covered with glass, which affords shelter from rain, 
&c. ; and this, again, can be enclosed by wire netting in a grass 
field or other suitable locale. The water in the artificial mother 
only requires to be renewed once in 24 hours. The receptacle 
holds 5 gallons of water, and 2 gallons added are sufficient. 
The price of the mother alone, without the external shelter, is 
2/. Of course the apparatus is made in different sizes, capable 
of dealing with from 50 to 450 eggs. 
Mr. Christy's experience has led him to the conclusion that 
the water space must be of a certain size, sufficient to hold 15 
gallons, in order that a tolerably uniform temperature may be 
maintained, hence his smallest machine is for 90 eggs. I re- 
produce a drawing and description from his pamphlet on 
" Hydro-Incubation," and those who are interested in the sub- 
ject will do well to spend one shilling in the purchase of this 
book. 
Fig. 9. — View of Messrs. Christy and Co.'s Hydro-incubator. 
Hydro-incubator for 90 Eggs, 
A is the pipe only used for completely emptying the cistern ; b, the brass 
tap for drawing off the water prior to replenishing the cistern with boiling 
water; c, the glass gauge, with a marked scale, d, at the side, to register 
the height of the water in the cistern : e, the pipe for filling the cistern ; F, 
the tube for the escape of air when the water is put into the cistern ; g, the 
drawer, into the front of which the new earth-trays slide ; H, the thermometer 
in the drawer; i, i, the air-holes in the sides of the incubator and drawer; 
J, the flannel ; k, the stand or box used to keep the incubator off the ground ; 
L, the earth-trays. 
